1 /* 2 * QEMU PC System Firmware 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * Copyright (c) 2011-2012 Intel Corporation 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "sysemu/blockdev.h" 27 #include "qemu/error-report.h" 28 #include "hw/sysbus.h" 29 #include "hw/hw.h" 30 #include "hw/i386/pc.h" 31 #include "hw/boards.h" 32 #include "hw/loader.h" 33 #include "sysemu/sysemu.h" 34 #include "hw/block/flash.h" 35 #include "sysemu/kvm.h" 36 37 #define BIOS_FILENAME "bios.bin" 38 39 typedef struct PcSysFwDevice { 40 SysBusDevice busdev; 41 uint8_t isapc_ram_fw; 42 } PcSysFwDevice; 43 44 static void pc_isa_bios_init(MemoryRegion *rom_memory, 45 MemoryRegion *flash_mem, 46 int ram_size) 47 { 48 int isa_bios_size; 49 MemoryRegion *isa_bios; 50 uint64_t flash_size; 51 void *flash_ptr, *isa_bios_ptr; 52 53 flash_size = memory_region_size(flash_mem); 54 55 /* map the last 128KB of the BIOS in ISA space */ 56 isa_bios_size = MIN(flash_size, 128 * 1024); 57 isa_bios = g_malloc(sizeof(*isa_bios)); 58 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 59 &error_abort); 60 vmstate_register_ram_global(isa_bios); 61 memory_region_add_subregion_overlap(rom_memory, 62 0x100000 - isa_bios_size, 63 isa_bios, 64 1); 65 66 /* copy ISA rom image from top of flash memory */ 67 flash_ptr = memory_region_get_ram_ptr(flash_mem); 68 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 69 memcpy(isa_bios_ptr, 70 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 71 isa_bios_size); 72 73 memory_region_set_readonly(isa_bios, true); 74 } 75 76 #define FLASH_MAP_UNIT_MAX 2 77 78 /* We don't have a theoretically justifiable exact lower bound on the base 79 * address of any flash mapping. In practice, the IO-APIC MMIO range is 80 * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free 81 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in 82 * size. 83 */ 84 #define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024)) 85 86 /* This function maps flash drives from 4G downward, in order of their unit 87 * numbers. The mapping starts at unit#0, with unit number increments of 1, and 88 * stops before the first missing flash drive, or before 89 * unit#FLASH_MAP_UNIT_MAX, whichever is reached first. 90 * 91 * Addressing within one flash drive is of course not reversed. 92 * 93 * An error message is printed and the process exits if: 94 * - the size of the backing file for a flash drive is non-positive, or not a 95 * multiple of the required sector size, or 96 * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN. 97 * 98 * The drive with unit#0 (if available) is mapped at the highest address, and 99 * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is 100 * not supported. 101 */ 102 static void pc_system_flash_init(MemoryRegion *rom_memory) 103 { 104 int unit; 105 DriveInfo *pflash_drv; 106 BlockDriverState *bdrv; 107 int64_t size; 108 char *fatal_errmsg = NULL; 109 hwaddr phys_addr = 0x100000000ULL; 110 int sector_bits, sector_size; 111 pflash_t *system_flash; 112 MemoryRegion *flash_mem; 113 char name[64]; 114 115 sector_bits = 12; 116 sector_size = 1 << sector_bits; 117 118 for (unit = 0; 119 (unit < FLASH_MAP_UNIT_MAX && 120 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL); 121 ++unit) { 122 bdrv = pflash_drv->bdrv; 123 size = bdrv_getlength(bdrv); 124 if (size < 0) { 125 fatal_errmsg = g_strdup_printf("failed to get backing file size"); 126 } else if (size == 0) { 127 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 128 "cannot have zero size"); 129 } else if ((size % sector_size) != 0) { 130 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " 131 "must be a multiple of 0x%x", sector_size); 132 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) { 133 fatal_errmsg = g_strdup_printf("oversized backing file, pflash " 134 "segments cannot be mapped under " 135 TARGET_FMT_plx, FLASH_MAP_BASE_MIN); 136 } 137 if (fatal_errmsg != NULL) { 138 Location loc; 139 140 /* push a new, "none" location on the location stack; overwrite its 141 * contents with the location saved in the option; print the error 142 * (includes location); pop the top 143 */ 144 loc_push_none(&loc); 145 if (pflash_drv->opts != NULL) { 146 qemu_opts_loc_restore(pflash_drv->opts); 147 } 148 error_report("%s", fatal_errmsg); 149 loc_pop(&loc); 150 g_free(fatal_errmsg); 151 exit(1); 152 } 153 154 phys_addr -= size; 155 156 /* pflash_cfi01_register() creates a deep copy of the name */ 157 snprintf(name, sizeof name, "system.flash%d", unit); 158 system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name, 159 size, bdrv, sector_size, 160 size >> sector_bits, 161 1 /* width */, 162 0x0000 /* id0 */, 163 0x0000 /* id1 */, 164 0x0000 /* id2 */, 165 0x0000 /* id3 */, 166 0 /* be */); 167 if (unit == 0) { 168 flash_mem = pflash_cfi01_get_memory(system_flash); 169 pc_isa_bios_init(rom_memory, flash_mem, size); 170 } 171 } 172 } 173 174 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 175 { 176 char *filename; 177 MemoryRegion *bios, *isa_bios; 178 int bios_size, isa_bios_size; 179 int ret; 180 181 /* BIOS load */ 182 if (bios_name == NULL) { 183 bios_name = BIOS_FILENAME; 184 } 185 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 186 if (filename) { 187 bios_size = get_image_size(filename); 188 } else { 189 bios_size = -1; 190 } 191 if (bios_size <= 0 || 192 (bios_size % 65536) != 0) { 193 goto bios_error; 194 } 195 bios = g_malloc(sizeof(*bios)); 196 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_abort); 197 vmstate_register_ram_global(bios); 198 if (!isapc_ram_fw) { 199 memory_region_set_readonly(bios, true); 200 } 201 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); 202 if (ret != 0) { 203 bios_error: 204 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); 205 exit(1); 206 } 207 if (filename) { 208 g_free(filename); 209 } 210 211 /* map the last 128KB of the BIOS in ISA space */ 212 isa_bios_size = bios_size; 213 if (isa_bios_size > (128 * 1024)) { 214 isa_bios_size = 128 * 1024; 215 } 216 isa_bios = g_malloc(sizeof(*isa_bios)); 217 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, 218 bios_size - isa_bios_size, isa_bios_size); 219 memory_region_add_subregion_overlap(rom_memory, 220 0x100000 - isa_bios_size, 221 isa_bios, 222 1); 223 if (!isapc_ram_fw) { 224 memory_region_set_readonly(isa_bios, true); 225 } 226 227 /* map all the bios at the top of memory */ 228 memory_region_add_subregion(rom_memory, 229 (uint32_t)(-bios_size), 230 bios); 231 } 232 233 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw) 234 { 235 DriveInfo *pflash_drv; 236 237 pflash_drv = drive_get(IF_PFLASH, 0, 0); 238 239 if (isapc_ram_fw || pflash_drv == NULL) { 240 /* When a pflash drive is not found, use rom-mode */ 241 old_pc_system_rom_init(rom_memory, isapc_ram_fw); 242 return; 243 } 244 245 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 246 /* Older KVM cannot execute from device memory. So, flash memory 247 * cannot be used unless the readonly memory kvm capability is present. */ 248 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n"); 249 exit(1); 250 } 251 252 pc_system_flash_init(rom_memory); 253 } 254